berge



2 Sheets-Sheet 1.

(No Model.)

B. F. BERGH.

ROCK DRILL MACHINE.

Patented Sept [III N, PEYERS. Photo-Lithographer. Washinglcn. ac

2 Sheets-Sheet 2.

(lie Model.)

B.F,BERG H ROCK DRILL MACHINE,

No. 349,560. Patented Sept. 21, 1886.

rllll U31 fig. 2.

aim J a z l/l/ I I I CZ III UNITED STATES PATENT OFFICE.

BROR F. BERGH, OF NE\V YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE STANDARD HANDBOOK DRILL COMPANY, OF SAME PLACE.

ROCK-DRILL MACHINE.

SPECIFICATION forming part of Letters Patent No. 349,560, dated September 21, 1886,

Application filed February 6, 1885. Serial No. 155,658. (No model.)

To all whom it may concern.-

Be it known that I, BROR F. BERGH, of the city of New York, in the county and State of New York, have invented a new and useful Improvementin Rock-Drill Machines, of which the following is a specification.

In Letters Patent No. 308,947, dated December 9, 1884, I have described a rock-drill machine; and the object of my present invention is to provide improved mechanism for supporting, guiding, and feeding forward the drill and hammer operating parts in a more simple and efficient manner thanwill the mechanism described in that patent.

It will be understood that the mechanism for operating the hammer and drill-holder may be the same as that described in said patent, or like that described in an application filed simultaneously herewith, or of any other construction suitable for giving proper motionto the parts.

In the drawings, Figure 1 represents a side view of the drill-machine, with the side pieces of the supporting-frame broken away. Fig.

2 represents a front vie-w of supporting-frame and sliding frame and connected parts. Fig.

' 3 represents a cross-section through the line 3 3 of Figs. 1 and 2. Fig. etrepresents the drillholder, with the surrounding mechanism in 30 longitudinal section through the line4 4, Fig.1.

My invention consists in combining with a rotated drill-holder mechanism for feeding the sliding frame forward on the supporting-frame, and which receives its motion (whenever the 3 5 drill has advanced so as to require feed) from the rotation of the drill-holder, the motion of the feeding parts having heretofore been de rived from the lifting mechanism or from other sources.

My invention also consists in combining with a member actuated by the downward and by the rotating motions of the drill-holdcr araek or equivalent device attached to the supporting-frame and interposed mechanism connected with the sliding frame of the machine and with the rack in such manner that the operation of the interposed mechanism causes the sliding frame to advance upon the supporting-frame, the said member being so located and formed as to engage with the said interposed mechanism and operate the same whenever the drill-holder advances beyond a certain point relatively to the sliding frame.

My invention also consists in pivoting the rack to the supportirig-frame, so that it may 5 5 be swung into or out of gear with the said interposed mechanism.

My invention also consists in making the connection between the rack and the sliding frame by a worm-gear wheel mounted and 6 turning upon the drill-l1older within a recess in the sliding frame.

My invention also consists in making the connection between the drill-holder and the mechanism interposed between the sliding 6 5 frame and the rack by means of a collar mounted upon the drill-holder and contain ing teeth which engage with teeth upon the upper edge of a wheel gearing with the rack.

My invention also consists in interposing between the toothed member connected with the drill-holder and the mechanism for reciprocating the drill-holder a spring, so that when the teeth are in operation a yielding pressure may be maintained between them. 5

My invention also consists in combining with the supporting-frame a double-pointed footpiece connected so as to slide in the bottom of the frame, in contradistinction to being pivoted, as heretofore.

My invention also consists in combining a ratchet for rotating the drill with a toothed member for operating the feed, and having teeth which will not index with the ratchet.

My invention also consistsin combining with 8 a cross-pointed drill a ratchet for turning the drill containing teeth which do not index with the points on the drill.

My invention also consists in other features set forth in the claims. 7

Ais the sliding frame, upon which are mounted the mechanisms for distributing the motions of the hand-levers to the hammer and the drill-holder.

B is the supporting-frame, containing the 5 guideways at b b, in which the wings a a of the sliding frame A slide. The supportingframe 13 at b b b b is provided with pins for the attachment of the tripod, should one be used. At 0 the supporting-frame B is also the supporting-frame B are connected at the top and bottom by pieces which are outwardly bowed, as shown in Fig. 3, so as to admit of the free passage of the sliding frame between the guideways. To these outwardly bowed pieees'the center piece of the frame 13 is attached, as shown in Figs. 1, 2, and 3.

G is a rack, which is pivoted at top and bottom in studs 0 d, which studs are attached to the center piece of the supporting-frame, so as to sustain the rack in the position shown at one side or in front of the sliding frame A. WVhen this rack is in the position shown in the drawings,it engages with the worm-gear wheel,hereinafter referred to. It is prevented from swinging on one side by the stop 0", but on the other side is free to swing around, so as to be out of gear with the worm-gearwheel. XVhen the rack is thus out of gear with the worm-wheel, it will be seen that the sliding frame A and connected parts may be easily and quickly brought to any desired position on the frame, ormay be removed therefrom by simply sliding it in the guideways b b. The bearings of the rack in the studs 0 d are arranged to give the rack sufficient longitudinal play to allow for the pitch of the worm-gear wheel, as it is thrown into or out of gear with the wormwheel, to insure facility in obtaining proper connection between the two.

D is a double-pointed foot-piece, substantially in the form of a crescent, as shown. It has a sliding connection in a recess formed in the lower connecting-piece between the guideways I) b. It is free to slide in this recess, so as to permit the points to adjust themselves in conformity with the surface of the rock, and is prevented from falling out of the recess by a pin, (1", passing through the supportingframe and working in a slot in the foot-piece D, as shown. This form of foot-piece is so firmly held in the recess at the bottom of the supporting-frame, and the bearing between it and the frame (as at d d) approaches so near the points of the foot-piece, that a very firm and durable support is afforded.

e is the hammer.

f is the lever (of which there is a pair) for reciprocating the drill.

g is the pawl (of which there is a pair) for turning the drill by engagement with a ratchet-on the flange of the nut h.

i is the drill-holder, and i thedrlll.

j is a'sleeve interposed between the drillholder and the barrel of the sliding frame A.

-Thissleeve 9' contains at its top a laterallyprojecting flange, j, which rests upon the top of the barrel of the sliding frame A.

k are two lugs, which extend upward from the flange j, one on each side of the drill-holder, to form the connectionbetween the sleeve j and the levers f, by means of the pins in said lugs bearing friction-rollers, (shown at Fig. 4,) on which the recesses in the levers f work.

Zis a guide-pin extending downward from the flangejinto a hole made for it in the'sliding frame A,to prevent rotation of the sleeve.

on is a spiral spring just below the sleeve 3'. and interposed between the drill-holder and the barrel of the sliding frame A, which latter is enlarged internally to allow said spring and the parts adjacent to it free play. This spring 122 terminates at its lower end in a collar, n, which is secured to the drill-holder by the screw a, Fig. 1. This screw 02 prevents any rotary movement of the collar '11 upon the drill-holder, but admits of a slight longitudinal movement between the two, because the head of the screw fits in a slot through the collar of suitable form for that purpose.

Just below the collar n the worm-gear wheel 0 is fitted loosely upon the drill-holder, and a recess in the barrel of the sliding frame is made to receive this wornrgear wheel, as shown in the drawings, so that the worm-gear wheel cannot move up or down without carrying the sliding frame with it.

To lessen the rigidity of the contact, and as a packing to exclude dirt, a washer, 0, of elastic material is placed between the upper side of the wheel 0 and the sliding frame A, as shown. The adjacent edges of the wheel 0 and the collar n are provided with teeth of the form shown in dotted lines at Figs. 1 and 4. The engagement of these teeth when the collar n is rotated causes the rotation of the wheel 0. The wheel 0 on its periphery is provided with a worm which engages with the rack O.

The operation of the machine is as follows: As shown in the drawings, the hammer is down, as when deliveringits stroke. The drill is therefore at thebottom of the bore-hole and the drill-holder at the lower end of its stroke. The support of the drill on the rock lifts the nut it slightly out of contact with the flange as shown in Fig. 4. The teeth on the collar a and wheel 0 are in aposition to just clear each other, which shows that the drill has not yet advanced into the rock since the last feed suffieiently far to require further feed. \Vhen, therefore, the hammer is raised for another stroke, theleversf will raise the sleevej until the contact ofsthe flange with the nut h lifts the drill-holder, and will then lowerthe sleeve j until the contact is broken between the flange j and the nut h, as shown in the drawings, Fig. 1. The drill-holderbeing on the return-stroke forced downwardby the action of the sleeve j on the spring on and collar a, the yielding of the spring admits of the slight separation shown between the flange j and the nut h until the drill rests at the bottom'of the borehole. As the-drill-holder is thus raisedand forced downward, however, it is turned on its downward stroke by the operation of the pawls g. The hammer then deliversablow. Up to this point no feed has taken place, because the teeth on the collar n and wheel 0 have-not been engaged; but the effect of the blow just given by the hammer is to force the drill farther into the rock, driving the drill-holder farther forward relative] y to the sliding frame, and consequently advancing the collar a toward the wheel 0. If this advance is far enough to cause the teeth on the collar to engage with the teeth on the wheel, the drillholder will on its next downward stroke, by its rotation, cause a corresponding rotation of the wheel 0, which, by virtue of the coaction of the worm and the rack, will cause the sliding frame to advance a certain distance on the guideways of the supporting-frame. This advance will be sufficient to bring the wheel below the point where its teeth engage the teeth on the collar n,so that the succeeding blow of the hammer will find the sliding frame and all its attachments sufficiently in advance of the drill-holder. The parts are so proportioned that in practice the lower shoulder of the nut it should never be brought into contact'with the fiangej by the force of a blow of the hammer, and therefore the force of the blow will not be communicated to the teeth between the worm-wheel-and the rack or to the machine in general; butshould this occur at any time, as in consequence of a soft spot in the rock, I provide for deadening the effect of the blow on the worm-wheel and the rack by interposing the thick washer of leather or elastic material, 0, between the wheel 0 and the frame above it. Furthermore, the parts are so. proportioned that the teeth on the collar a should never strike either the points or the base of the teeth 011 the wheel 0; but should this ever occur no damage can result, because the slot in'which the head of the screw n works permits that screw to move forward with the drill-holder without affecting the other parts,exceptin g in so far as it compresses the spring in.

In practice I prefer to make the ratchet on the nnth two and ahalf (25) inches in external diameter and to place upon it ten (10) teeth. The external diameterof the teeth on the wheel 0 and the collar a, I prefer to make one and five-eighths (1%) inch. The number of teeth here may be twenty-six (26) on the collar and alike number on the wheel. The worm-Wheel 0 may be three and one-half (3%) inches in diameter with four (4) threads, each thread having a pitch of one (1) inch. These proportions are adapted for a drilling-tool having four points. The dimensions and proportions given may be varied; but it is important that the teeth on the collar a and wheel 0 should not index with the teeth on the nut h, and also that the teeth on the nut h should not index with the points on the drill 2'. Care should therefore be taken that the numbers of teeth in these three sets should not correspond or be multiples of one another. Otherwise the tendency might be for the points of the drill to cut the rock in the same position on each succeeding revolution, and for the teeth on the wheel 0 and collar a to fail in producing the proper feed.

I have described the use of teeth as the means for making the connection between the collar n and wheel 0, this being the preferable means; but wherever mentioned in this speeification I do not mean to limit myself to that means,but desire to include other means which will substantially accomplish the same result. The points of the teeth on the collar a can never be driven against the base of the teeth on the wheel 0, because the depth of the teeth is made greater than the space between the flangej and the nut 71 so that the nut it would come in contact with the flange j and cause the force of the blow to be received on the elastic washer 0' before the points of one set of teeth could reach the base of the other set of teeth. Furthermore, if the points of one set of teeth should ever reach the base of the opposite set of teeth, no damage could occur, because the slot in which the head of the screw 11. is fitted would permit the collar a to be pressed upward on'the spindle against the force of the spring m.

Among the advantages derivable from my invention may be mentioned that the motion of the feeding parts is received from the rotation of the drill; that the number and complication of mechanical parts is deereased,while greater efficiency is secured; that no frictionconnection is requisite for holding the sliding, frame in position on the supporting-frame at any stage of the operation, and thus the power necessary to overcome the friction is saved; that the drill is positively reciproeated in each direction, so that its return to the bottom of the borehole is insured; that the sliding frame is readily'thrown out of gear with the supporting-frame; that the parts can be readily repaired or replaced; that the connection between the worm and rack prevents any backlash er sliding motion, incident to-the use ofarack and pinion. p I

I do not intend to limit myself to the details of construction which I have shown, but intend to include modifications which accomplish substantially the same results in whole or in part.

I claim-- 1. In a rock-drill machine, the combination, with the supporting-frame containing two side pieces provided with guideways, and provided at top and bottom with outwardly bowed pieces connecting the side pieces, of a rack connected with the outwardly-bowcd connecting-pieces of the frame, so as to be parallel with the guideways, and a gear-wheel. mounted in the sliding frame and engaging with the rack, the said rack being pivotally connected to said supporting-frame, whereby it is adapted to be thrown into or out of engagement with said gear-wheel, substantially as described.

2. In combination, the supporting-frame, the sliding frame, the rotated drill-holder, the rack connected with thesupportingframe, the gear mounted in the sliding frame and engaging with the rack, whereby the sliding frame is held stationary on the supportingframe, caused to advance thereon according as said gear is at rest or in motion, and mechanism interposed between. said gear and the drillholder, whereby the rotating motion of said drill-holder is communicated to said gear whenever the said drill-holder has advanced beyond a fixed point relatively to the sliding frame, substantially as described.

3. In combination, the supportingframe, the sliding frame, the rotated drill-holder, the rack .on the supportingframe, the gear-wheel mounted in the sliding frame and engaging with said rack, and the gear-teeth interposed between said gear-wheel and said drill-holder, wherebythe rotation of the drill-holder is communicated to said gear-wheel, substantially as described.

4. In a rock-drill machine, the supportingframe adapted to rest upon the rock, the sliding frame sustaining the hammer and suitable mechanism for operating the hammer and drill, the drillholder, the spring pressed toothed collar encircling the drill-holder and rotating with the same, and the toothed wheel mounted in the sliding frame and adapted to engage with the supporting-frame, all combined substantially as described.

5. In a rock-drill machine, the supporting frame adapted to rest upon the rock, the

sliding frame sustaining the hammer and suitable mechanism for operating thehammcr and drill, the reciprocating drill-holder rotated on its downward stroke, the piece a, actuated by the rotary and reciprocating motions of the drill-holder, and the piece 0, mounted in the sliding frame and engaging with the supporting-frame, the construction and arrangement of the parts 0 and a being such as to adapt them to engage each other whenever the drill on its downward stroke has advanced beyond a fixed point, relatively to the sliding frame.

6. In combination, the supporting-frame, the sliding frame bearing the actuating mechanism, the rotated and reciproeated drillholder, the toothed member, as a, rotating therewith, and the wheels, as 0, mounted in the sliding frame and constructed to engage both with a rack mounted on the supportingframe and also with said toothed member a when the drill holder has advanced beyond a certain point relatively to the sliding frame, all substantiall y as described, whereby the said wheel, when actuated by the rotation of the drill through the medium of said toothed member,

is impelled to travel forward on said rack, and when not actuated by the rotation of the drill acts as a locking device between the sliding and supporting frames.

7. In combination, the supporting-frame, the sliding frame, the rotated drill-holder, the wheel mounted in the sliding frame with its plane of rotation parallel with that of the drill-holder by which it is actuated, and a worm upon'the periphery of said wheel ongaging with a rack on the supporting-frame, substantially as described.

8. In combination, the ratchet h, revolving with the d rill-holder, the slecvej reci procati n g with the drill-holder, the collar a, secured to the drill-holder, the spring m, interposed between the sleeve and the collar, the gear-wheel I 0, mounted on the sliding frame, and means, substantially as described, for engaging the collar or with the wheel 0.

9. In combination, the supporting-frame, the sliding frame, the rotated drill-holder, the spring-pressed member a, connected with. the d rill-holder by a vertically-slotted connection, the gear-wheel mounted in the sliding frame and provided with means, substantially as described, for engaging with said spring-pressed member, and a rack on the supportingframe for engaging with said gear-wheel, substan tially as described.

10. In combination, the supporting-frame, the sliding frame, the drill-holder, the ratchet h, the pawls engaging with said ratchet, whereby the drill-holder is rotated, the rack on the supporting-frame, the gear-wheel mounted in the sliding frame and engaging with said rack, and the gear-teeth interposed between said gear-wheel and said drill-holder, whereby the rotation of the drill-holder is communicated to said gear-wheel, the number of teeth on said ratchet h and of said interposed gearteeth being respectively such that said two sets of teeth do not index one with another, substantially as described.

11.. In combination with the supportingframe, the double-pointed foot-piece I), held in a recess in the bottomof the frame and formed with a curved slot for the pin (1, substantially as described.

BROR F. BERGI-I.

\Vitnesses:

T. J. 'IQEANE, D. H. DRISOOLL. 

